package org.jeecg.common.util.encryption;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.shiro.codec.Base64;

/** AES 加密 */
public class AesEncryptUtil {

  // 使用AES-128-CBC加密模式，key需要为16位,key和iv可以相同！
  private static String KEY = EncryptedString.key;
  private static String IV = EncryptedString.iv;

  /**
   * 加密方法
   *
   * @param data 要加密的数据
   * @param key 加密key
   * @param iv 加密iv
   * @return 加密的结果
   * @throws Exception
   */
  public static String encrypt(String data, String key, String iv) throws Exception {
    try {

      Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding"); // "算法/模式/补码方式"NoPadding PkcsPadding
      int blockSize = cipher.getBlockSize();

      byte[] dataBytes = data.getBytes();
      int plaintextLength = dataBytes.length;
      if (plaintextLength % blockSize != 0) {
        plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
      }

      byte[] plaintext = new byte[plaintextLength];
      System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);

      SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
      IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

      cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
      byte[] encrypted = cipher.doFinal(plaintext);

      return Base64.encodeToString(encrypted);

    } catch (Exception e) {
      e.printStackTrace();
      return null;
    }
  }

  /**
   * 解密方法
   *
   * @param data 要解密的数据
   * @param key 解密key
   * @param iv 解密iv
   * @return 解密的结果
   * @throws Exception
   */
  public static String desEncrypt(String data, String key, String iv) throws Exception {
    try {
      byte[] encrypted1 = Base64.decode(data);

      Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
      SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
      IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

      cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);

      byte[] original = cipher.doFinal(encrypted1);
      String originalString = new String(original);
      return originalString;
    } catch (Exception e) {
      e.printStackTrace();
      return null;
    }
  }

  /**
   * 使用默认的key和iv加密
   *
   * @param data
   * @return
   * @throws Exception
   */
  public static String encrypt(String data) throws Exception {
    return encrypt(data, KEY, IV);
  }

  /**
   * 使用默认的key和iv解密
   *
   * @param data
   * @return
   * @throws Exception
   */
  public static String desEncrypt(String data) throws Exception {
    return desEncrypt(data, KEY, IV);
  }

  //    /**
  //     * 测试
  //     */
  //    public static void main(String args[]) throws Exception {
  //        String test1 = "sa";
  //        String test =new String(test1.getBytes(),"UTF-8");
  //        String data = null;
  //        String key =  KEY;
  //        String iv = IV;
  //        // /g2wzfqvMOeazgtsUVbq1kmJawROa6mcRAzwG1/GeJ4=
  //        data = encrypt(test, key, iv);
  //        System.out.println("数据："+test);
  //        System.out.println("加密："+data);
  //        String jiemi =desEncrypt(data, key, iv).trim();
  //        System.out.println("解密："+jiemi);
  //    }

}
